CsPb(Br/I)₃ Perovskite Nanocrystals for Hybrid GaN-Based High-Bandwidth White Light-Emitting Diodes

Abstract

The modulation bandwidth of white light-emitting diodes (LEDs) is an important factor in a visible-light communication (VLC) system, which is mainly limited by the down-conversion materials. The broad spectrum and long lifetime of conventional light conversion materials represent an obstacle to future technological developments. Here, we show that inorganic semiconductor perovskite nanocrystals offer a promising alternative nanomaterial. Anion exchange between different perovskite nanocrystals by post-synthesis is a highly efficient protocol to tune the chemical composition and optoelectronic properties of lead halide perovskite nanocrystals. The fine-tuning of the nanocrystal fluorescence is achieved by blending colloidal solutions of CsPb­(Br/I)3 lead halide perovskites with different contents of the halide. The tunable optical emission and short fluorescence lifetime (<5 ns) of the nanocrystals are exploited to realize white LEDs with a high modulation bandwidth (0.7 GHz), offering a potential route toward fast, energy-efficient visible-light communication.

High bandwidth semipolar (20–21) micro-LED-based white light-emitting diodes utilizing perovskite quantum dots and organic emitters in color-conversion layers for visible light communication and solid-state lighting applications

“…15,16 The use of a blue µLED and CdSe/ZnS quantum dots (QDs) to create a white light emitting diode (WLED) with a bandwidth of 0.63 GHz and a correlated color temperature (CCT) of ∼20 000 K was demonstrated by Cao et al 17 Ma et al proposed the use of CsPb(Br/I) 3 perovskite quantum dots (PQDs) in µLED-based WLEDs, which resulted in a white-light bandwidth of 0.75 GHz with a tunable CCT. 18 Similarly, a commercial organic yellow emitter (Super Yellow) combined with a µLED (bandwidth of 60 MHz) was shown to produce a white light bandwidth of 0.53 MHz and a data rate of 1.68 Gbps using DC-biased optical OFDM. 19 One strategy to further increase the bandwidth of a visible light communication (VLC) system is to use semipolar plane (20)(21) grown µLEDs as pumping sources.…”

Monolithic Multicolor Emissions of InGaN-Based Hybrid Light-Emitting Diodes Using CsPbBr3 Green Quantum Dots

“…Recently, perovskite QDs have been studied to improve light-conversion efficiency due to their Cd-free properties [ 19 , 20 ]. In particular, CsPbBr 3 perovskite QDs are superior to conventional QD materials because of their high light absorption coefficient and stability [ 19 , 20 , 21 ].…”

“…Recently, perovskite QDs have been studied to improve light-conversion efficiency due to their Cd-free properties [ 19 , 20 ]. In particular, CsPbBr 3 perovskite QDs are superior to conventional QD materials because of their high light absorption coefficient and stability [ 19 , 20 , 21 ]. In addition, CsPbBr 3 QDs have a pure green photoluminescence (PL) emission of approximately 520 nm with a narrower bandwidth and higher quantum efficiency of ~90% [ 21 ].…”

Facilely synthesized carbon dots and configurated light-emitting diodes with efficient electroluminescence

“…Portable and high-resolution consumer electronic products have shown accelerated development of displays and solidstate lighting, making tremendous breakthroughs from conventional GaN-based light-emitting diodes (LEDs) to low power consumption and flexible organic LEDs (OLEDs). [1][2][3][4] Quantum dot (QD) LEDs as well as OLEDs have attracted tremendous attention and are considered the next mainstream technology in solid-state electroluminescence (EL) owing to their wide color gamut, facile synthesis, and scalable manufacturing. [5][6][7][8][9] However, most conventional semiconductor QDs contain nonenvironment-friendly heavy metals.…”